Internal Telephone Wiring

Since my ADSL2+ upgrade my connection has dropped from 588 kbps to 448 kbps. As part of trying to improve this I thought I would take a look at our internal wiring after reading about the negative implications of the bell wire, etc.

I ended up rather confused by the wiring we have. The telephone wire enters the house to an old junction box. I can't look inside as it requires half the wall to be removed to do so. From there there are two main sockets, well, they look like regular sockets but have a capacitor inside. Neither appear to have a bell wire so just pins 2 & 5 are used.

From one of these boxes there is an extension wired in, simply taken from the 2 & 5 pins but the extension also has pin 3 from this 'master socket' to the extension (but not from the socket back to the junction box).

Aside from the apparently random combination of sockets and wiring my confusion arises from the apparent bell wire on pin 3 on the extension. The ADSL router sits on the end of this extension and although it may have been coincidence, removing this supposedly unused bell wire caused the router to drop the connection. Refitting it and the connection returned.

Any ideas or suggestions?

DownStream

Connection Speed - 480 kbps
Line Attenuation - 63.5 db
Noise Margin - 12.4 db

UpStream

Connection Speed - 448 kbps
Line Attenuation - 31.5 db
Noise Margin - 13.0 db

Can you put some photos up on ImageShack or similar?

removing the bell wire can trigger a retrain but the connection would have come back in a minute or two. Perhaps the wiring is incorrect so 3 becomes 2 or 5 at the extension ?

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Are your kids pirates ? Limewire, Bearshare, Kazaa, BitTorrent, eMule are all tools of the trade.

It did seem pretty random particularly as the wiring on pin 5 of one of the master socket and the ongoing extension is an orange wire for both yet that 'should' be the bell wire going to pin 3.

Connection was down for around ten plus minutes until fairly soon after I put the bell wire back. Seemed very strange as the bell wire doesn't continue from the master socket to the main junction box.

Did you resolve this http://forums.thinkbroadband.com/general/t/3539299-m... ?
A series of photos, as suggested, would make troubleshooting much easier

BTBroadband

Not sure what pictures would prove useful above and beyond the description but let me know and I will do my best to get some taken.

Picture of this

The telephone wire enters the house to an old junction box. I can't look inside as it requires half the wall to be removed to do so.

pictures inside these

From there there are two main sockets, well, they look like regular sockets but have a capacitor inside. Neither appear to have a bell wire so just pins 2 & 5 are used.

Picture inside this

From one of these boxes there is an extension wired in, simply taken from the 2 & 5 pins but the extension also has pin 3 from this 'master socket' to the extension (but not from the socket back to the junction box).

Is it normal for the noise margin on the downstream side to vary between 9.3 to 12.3 before my eyes?

Working on the pictures...

It can I'm afraid.

If your line is normally more stable then it will be down to some type of interference.
The storms that are doing the rounds can certainly cause this.

-------------------------------------------
Freeola[EntaNet]
Hmmm...
SNR: Netgear DG834>2Wire 2700>Thomson ST585v6 My Router Experience

63.5dB is the highest attenuation that a router can report. It could well be higher but "the needle has hit the end stop", as it were. I don't think you are going to see much better from that line, I'm afraid.

Sorry, that reply was to asanyfuleno - I hit the wrong button.

Home ADSL: Sky Max LLU
Business ADSL: ZeN Office 8000

Edited by zebedeee (Fri 17-Jul-09 17:16:14)